root / hw / virtio-pci.c @ 94ad5b00
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/*
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* Virtio PCI Bindings
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*
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* Copyright IBM, Corp. 2007
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* Copyright (c) 2009 CodeSourcery
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Paul Brook <paul@codesourcery.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <inttypes.h> |
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#include "virtio.h" |
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#include "virtio-blk.h" |
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#include "virtio-net.h" |
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#include "pci.h" |
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#include "qemu-error.h" |
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#include "msix.h" |
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#include "net.h" |
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#include "loader.h" |
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#include "kvm.h" |
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#include "blockdev.h" |
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|
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/* from Linux's linux/virtio_pci.h */
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/* A 32-bit r/o bitmask of the features supported by the host */
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#define VIRTIO_PCI_HOST_FEATURES 0 |
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/* A 32-bit r/w bitmask of features activated by the guest */
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#define VIRTIO_PCI_GUEST_FEATURES 4 |
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|
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/* A 32-bit r/w PFN for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_PFN 8 |
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/* A 16-bit r/o queue size for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_NUM 12 |
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|
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/* A 16-bit r/w queue selector */
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#define VIRTIO_PCI_QUEUE_SEL 14 |
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|
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/* A 16-bit r/w queue notifier */
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#define VIRTIO_PCI_QUEUE_NOTIFY 16 |
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/* An 8-bit device status register. */
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#define VIRTIO_PCI_STATUS 18 |
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|
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/* An 8-bit r/o interrupt status register. Reading the value will return the
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* current contents of the ISR and will also clear it. This is effectively
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* a read-and-acknowledge. */
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#define VIRTIO_PCI_ISR 19 |
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|
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/* MSI-X registers: only enabled if MSI-X is enabled. */
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/* A 16-bit vector for configuration changes. */
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#define VIRTIO_MSI_CONFIG_VECTOR 20 |
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/* A 16-bit vector for selected queue notifications. */
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#define VIRTIO_MSI_QUEUE_VECTOR 22 |
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/* Config space size */
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#define VIRTIO_PCI_CONFIG_NOMSI 20 |
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#define VIRTIO_PCI_CONFIG_MSI 24 |
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#define VIRTIO_PCI_REGION_SIZE(dev) (msix_present(dev) ? \
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VIRTIO_PCI_CONFIG_MSI : \ |
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VIRTIO_PCI_CONFIG_NOMSI) |
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/* The remaining space is defined by each driver as the per-driver
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* configuration space */
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#define VIRTIO_PCI_CONFIG(dev) (msix_enabled(dev) ? \
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VIRTIO_PCI_CONFIG_MSI : \ |
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VIRTIO_PCI_CONFIG_NOMSI) |
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/* Virtio ABI version, if we increment this, we break the guest driver. */
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#define VIRTIO_PCI_ABI_VERSION 0 |
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/* How many bits to shift physical queue address written to QUEUE_PFN.
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* 12 is historical, and due to x86 page size. */
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#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 |
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/* Flags track per-device state like workarounds for quirks in older guests. */
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#define VIRTIO_PCI_FLAG_BUS_MASTER_BUG (1 << 0) |
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/* Performance improves when virtqueue kick processing is decoupled from the
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* vcpu thread using ioeventfd for some devices. */
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1 |
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT) |
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/* QEMU doesn't strictly need write barriers since everything runs in
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* lock-step. We'll leave the calls to wmb() in though to make it obvious for
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* KVM or if kqemu gets SMP support.
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*/
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#define wmb() do { } while (0) |
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/* PCI bindings. */
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typedef struct { |
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PCIDevice pci_dev; |
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VirtIODevice *vdev; |
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uint32_t flags; |
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uint32_t addr; |
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uint32_t class_code; |
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uint32_t nvectors; |
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BlockConf block; |
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NICConf nic; |
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uint32_t host_features; |
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#ifdef CONFIG_LINUX
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V9fsConf fsconf; |
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#endif
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/* Max. number of ports we can have for a the virtio-serial device */
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uint32_t max_virtserial_ports; |
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virtio_net_conf net; |
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bool ioeventfd_disabled;
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bool ioeventfd_started;
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} VirtIOPCIProxy; |
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/* virtio device */
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static void virtio_pci_notify(void *opaque, uint16_t vector) |
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{
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VirtIOPCIProxy *proxy = opaque; |
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if (msix_enabled(&proxy->pci_dev))
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msix_notify(&proxy->pci_dev, vector); |
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else
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qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1); |
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} |
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static void virtio_pci_save_config(void * opaque, QEMUFile *f) |
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{
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VirtIOPCIProxy *proxy = opaque; |
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pci_device_save(&proxy->pci_dev, f); |
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msix_save(&proxy->pci_dev, f); |
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, proxy->vdev->config_vector); |
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} |
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|
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static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f) |
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{
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VirtIOPCIProxy *proxy = opaque; |
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n)); |
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} |
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|
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static int virtio_pci_load_config(void * opaque, QEMUFile *f) |
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{
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VirtIOPCIProxy *proxy = opaque; |
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int ret;
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ret = pci_device_load(&proxy->pci_dev, f); |
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if (ret) {
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return ret;
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} |
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msix_load(&proxy->pci_dev, f); |
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &proxy->vdev->config_vector); |
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} else {
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proxy->vdev->config_vector = VIRTIO_NO_VECTOR; |
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} |
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if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
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return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
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} |
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/* Try to find out if the guest has bus master disabled, but is
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in ready state. Then we have a buggy guest OS. */
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if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
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proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
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} |
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return 0; |
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} |
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static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f) |
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{
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VirtIOPCIProxy *proxy = opaque; |
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uint16_t vector; |
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &vector); |
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} else {
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vector = VIRTIO_NO_VECTOR; |
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} |
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virtio_queue_set_vector(proxy->vdev, n, vector); |
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if (vector != VIRTIO_NO_VECTOR) {
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return msix_vector_use(&proxy->pci_dev, vector);
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} |
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return 0; |
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} |
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static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy, |
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int n, bool assign) |
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{
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VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
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EventNotifier *notifier = virtio_queue_get_host_notifier(vq); |
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int r;
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if (assign) {
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r = event_notifier_init(notifier, 1);
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if (r < 0) { |
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error_report("%s: unable to init event notifier: %d",
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__func__, r); |
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return r;
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} |
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r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier), |
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proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY, |
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n, assign); |
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if (r < 0) { |
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error_report("%s: unable to map ioeventfd: %d",
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__func__, r); |
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event_notifier_cleanup(notifier); |
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} |
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} else {
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r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier), |
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proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY, |
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n, assign); |
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if (r < 0) { |
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error_report("%s: unable to unmap ioeventfd: %d",
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__func__, r); |
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return r;
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} |
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/* Handle the race condition where the guest kicked and we deassigned
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* before we got around to handling the kick.
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*/
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if (event_notifier_test_and_clear(notifier)) {
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virtio_queue_notify_vq(vq); |
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} |
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event_notifier_cleanup(notifier); |
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} |
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return r;
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} |
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|
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static void virtio_pci_host_notifier_read(void *opaque) |
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{
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VirtQueue *vq = opaque; |
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EventNotifier *n = virtio_queue_get_host_notifier(vq); |
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if (event_notifier_test_and_clear(n)) {
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virtio_queue_notify_vq(vq); |
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} |
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} |
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|
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static void virtio_pci_set_host_notifier_fd_handler(VirtIOPCIProxy *proxy, |
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int n, bool assign) |
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{
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VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
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EventNotifier *notifier = virtio_queue_get_host_notifier(vq); |
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if (assign) {
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qemu_set_fd_handler(event_notifier_get_fd(notifier), |
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virtio_pci_host_notifier_read, NULL, vq);
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} else {
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qemu_set_fd_handler(event_notifier_get_fd(notifier), |
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NULL, NULL, NULL); |
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} |
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} |
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|
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static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) |
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{
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int n, r;
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|
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if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
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proxy->ioeventfd_disabled || |
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proxy->ioeventfd_started) {
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return;
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} |
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|
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for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
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if (!virtio_queue_get_num(proxy->vdev, n)) {
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continue;
|
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} |
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|
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r = virtio_pci_set_host_notifier_internal(proxy, n, true);
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if (r < 0) { |
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goto assign_error;
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} |
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|
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virtio_pci_set_host_notifier_fd_handler(proxy, n, true);
|
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} |
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proxy->ioeventfd_started = true;
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return;
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|
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assign_error:
|
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while (--n >= 0) { |
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if (!virtio_queue_get_num(proxy->vdev, n)) {
|
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continue;
|
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} |
| 285 |
|
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virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
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r = virtio_pci_set_host_notifier_internal(proxy, n, false);
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assert(r >= 0);
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} |
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proxy->ioeventfd_started = false;
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error_report("%s: failed. Fallback to a userspace (slower).", __func__);
|
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} |
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|
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static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) |
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{
|
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int r;
|
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int n;
|
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|
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if (!proxy->ioeventfd_started) {
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return;
|
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} |
| 302 |
|
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for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
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if (!virtio_queue_get_num(proxy->vdev, n)) {
|
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continue;
|
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} |
| 307 |
|
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virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
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r = virtio_pci_set_host_notifier_internal(proxy, n, false);
|
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assert(r >= 0);
|
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} |
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proxy->ioeventfd_started = false;
|
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} |
| 314 |
|
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static void virtio_pci_reset(DeviceState *d) |
| 316 |
{
|
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VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev); |
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virtio_pci_stop_ioeventfd(proxy); |
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virtio_reset(proxy->vdev); |
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msix_reset(&proxy->pci_dev); |
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proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
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} |
| 323 |
|
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static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
| 325 |
{
|
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VirtIOPCIProxy *proxy = opaque; |
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VirtIODevice *vdev = proxy->vdev; |
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target_phys_addr_t pa; |
| 329 |
|
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switch (addr) {
|
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case VIRTIO_PCI_GUEST_FEATURES:
|
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/* Guest does not negotiate properly? We have to assume nothing. */
|
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if (val & (1 << VIRTIO_F_BAD_FEATURE)) { |
| 334 |
if (vdev->bad_features)
|
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val = proxy->host_features & vdev->bad_features(vdev); |
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else
|
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val = 0;
|
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} |
| 339 |
if (vdev->set_features)
|
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vdev->set_features(vdev, val); |
| 341 |
vdev->guest_features = val; |
| 342 |
break;
|
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case VIRTIO_PCI_QUEUE_PFN:
|
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pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
| 345 |
if (pa == 0) { |
| 346 |
virtio_pci_stop_ioeventfd(proxy); |
| 347 |
virtio_reset(proxy->vdev); |
| 348 |
msix_unuse_all_vectors(&proxy->pci_dev); |
| 349 |
} |
| 350 |
else
|
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virtio_queue_set_addr(vdev, vdev->queue_sel, pa); |
| 352 |
break;
|
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case VIRTIO_PCI_QUEUE_SEL:
|
| 354 |
if (val < VIRTIO_PCI_QUEUE_MAX)
|
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vdev->queue_sel = val; |
| 356 |
break;
|
| 357 |
case VIRTIO_PCI_QUEUE_NOTIFY:
|
| 358 |
virtio_queue_notify(vdev, val); |
| 359 |
break;
|
| 360 |
case VIRTIO_PCI_STATUS:
|
| 361 |
if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 362 |
virtio_pci_stop_ioeventfd(proxy); |
| 363 |
} |
| 364 |
|
| 365 |
virtio_set_status(vdev, val & 0xFF);
|
| 366 |
|
| 367 |
if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
|
| 368 |
virtio_pci_start_ioeventfd(proxy); |
| 369 |
} |
| 370 |
|
| 371 |
if (vdev->status == 0) { |
| 372 |
virtio_reset(proxy->vdev); |
| 373 |
msix_unuse_all_vectors(&proxy->pci_dev); |
| 374 |
} |
| 375 |
|
| 376 |
/* Linux before 2.6.34 sets the device as OK without enabling
|
| 377 |
the PCI device bus master bit. In this case we need to disable
|
| 378 |
some safety checks. */
|
| 379 |
if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
|
| 380 |
!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
|
| 381 |
proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
| 382 |
} |
| 383 |
break;
|
| 384 |
case VIRTIO_MSI_CONFIG_VECTOR:
|
| 385 |
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); |
| 386 |
/* Make it possible for guest to discover an error took place. */
|
| 387 |
if (msix_vector_use(&proxy->pci_dev, val) < 0) |
| 388 |
val = VIRTIO_NO_VECTOR; |
| 389 |
vdev->config_vector = val; |
| 390 |
break;
|
| 391 |
case VIRTIO_MSI_QUEUE_VECTOR:
|
| 392 |
msix_vector_unuse(&proxy->pci_dev, |
| 393 |
virtio_queue_vector(vdev, vdev->queue_sel)); |
| 394 |
/* Make it possible for guest to discover an error took place. */
|
| 395 |
if (msix_vector_use(&proxy->pci_dev, val) < 0) |
| 396 |
val = VIRTIO_NO_VECTOR; |
| 397 |
virtio_queue_set_vector(vdev, vdev->queue_sel, val); |
| 398 |
break;
|
| 399 |
default:
|
| 400 |
error_report("%s: unexpected address 0x%x value 0x%x",
|
| 401 |
__func__, addr, val); |
| 402 |
break;
|
| 403 |
} |
| 404 |
} |
| 405 |
|
| 406 |
static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
|
| 407 |
{
|
| 408 |
VirtIODevice *vdev = proxy->vdev; |
| 409 |
uint32_t ret = 0xFFFFFFFF;
|
| 410 |
|
| 411 |
switch (addr) {
|
| 412 |
case VIRTIO_PCI_HOST_FEATURES:
|
| 413 |
ret = proxy->host_features; |
| 414 |
break;
|
| 415 |
case VIRTIO_PCI_GUEST_FEATURES:
|
| 416 |
ret = vdev->guest_features; |
| 417 |
break;
|
| 418 |
case VIRTIO_PCI_QUEUE_PFN:
|
| 419 |
ret = virtio_queue_get_addr(vdev, vdev->queue_sel) |
| 420 |
>> VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
| 421 |
break;
|
| 422 |
case VIRTIO_PCI_QUEUE_NUM:
|
| 423 |
ret = virtio_queue_get_num(vdev, vdev->queue_sel); |
| 424 |
break;
|
| 425 |
case VIRTIO_PCI_QUEUE_SEL:
|
| 426 |
ret = vdev->queue_sel; |
| 427 |
break;
|
| 428 |
case VIRTIO_PCI_STATUS:
|
| 429 |
ret = vdev->status; |
| 430 |
break;
|
| 431 |
case VIRTIO_PCI_ISR:
|
| 432 |
/* reading from the ISR also clears it. */
|
| 433 |
ret = vdev->isr; |
| 434 |
vdev->isr = 0;
|
| 435 |
qemu_set_irq(proxy->pci_dev.irq[0], 0); |
| 436 |
break;
|
| 437 |
case VIRTIO_MSI_CONFIG_VECTOR:
|
| 438 |
ret = vdev->config_vector; |
| 439 |
break;
|
| 440 |
case VIRTIO_MSI_QUEUE_VECTOR:
|
| 441 |
ret = virtio_queue_vector(vdev, vdev->queue_sel); |
| 442 |
break;
|
| 443 |
default:
|
| 444 |
break;
|
| 445 |
} |
| 446 |
|
| 447 |
return ret;
|
| 448 |
} |
| 449 |
|
| 450 |
static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr) |
| 451 |
{
|
| 452 |
VirtIOPCIProxy *proxy = opaque; |
| 453 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 454 |
addr -= proxy->addr; |
| 455 |
if (addr < config)
|
| 456 |
return virtio_ioport_read(proxy, addr);
|
| 457 |
addr -= config; |
| 458 |
return virtio_config_readb(proxy->vdev, addr);
|
| 459 |
} |
| 460 |
|
| 461 |
static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr) |
| 462 |
{
|
| 463 |
VirtIOPCIProxy *proxy = opaque; |
| 464 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 465 |
addr -= proxy->addr; |
| 466 |
if (addr < config)
|
| 467 |
return virtio_ioport_read(proxy, addr);
|
| 468 |
addr -= config; |
| 469 |
return virtio_config_readw(proxy->vdev, addr);
|
| 470 |
} |
| 471 |
|
| 472 |
static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr) |
| 473 |
{
|
| 474 |
VirtIOPCIProxy *proxy = opaque; |
| 475 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 476 |
addr -= proxy->addr; |
| 477 |
if (addr < config)
|
| 478 |
return virtio_ioport_read(proxy, addr);
|
| 479 |
addr -= config; |
| 480 |
return virtio_config_readl(proxy->vdev, addr);
|
| 481 |
} |
| 482 |
|
| 483 |
static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val) |
| 484 |
{
|
| 485 |
VirtIOPCIProxy *proxy = opaque; |
| 486 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 487 |
addr -= proxy->addr; |
| 488 |
if (addr < config) {
|
| 489 |
virtio_ioport_write(proxy, addr, val); |
| 490 |
return;
|
| 491 |
} |
| 492 |
addr -= config; |
| 493 |
virtio_config_writeb(proxy->vdev, addr, val); |
| 494 |
} |
| 495 |
|
| 496 |
static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val) |
| 497 |
{
|
| 498 |
VirtIOPCIProxy *proxy = opaque; |
| 499 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 500 |
addr -= proxy->addr; |
| 501 |
if (addr < config) {
|
| 502 |
virtio_ioport_write(proxy, addr, val); |
| 503 |
return;
|
| 504 |
} |
| 505 |
addr -= config; |
| 506 |
virtio_config_writew(proxy->vdev, addr, val); |
| 507 |
} |
| 508 |
|
| 509 |
static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val) |
| 510 |
{
|
| 511 |
VirtIOPCIProxy *proxy = opaque; |
| 512 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
| 513 |
addr -= proxy->addr; |
| 514 |
if (addr < config) {
|
| 515 |
virtio_ioport_write(proxy, addr, val); |
| 516 |
return;
|
| 517 |
} |
| 518 |
addr -= config; |
| 519 |
virtio_config_writel(proxy->vdev, addr, val); |
| 520 |
} |
| 521 |
|
| 522 |
static void virtio_map(PCIDevice *pci_dev, int region_num, |
| 523 |
pcibus_t addr, pcibus_t size, int type)
|
| 524 |
{
|
| 525 |
VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev); |
| 526 |
VirtIODevice *vdev = proxy->vdev; |
| 527 |
unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) + vdev->config_len;
|
| 528 |
|
| 529 |
proxy->addr = addr; |
| 530 |
|
| 531 |
register_ioport_write(addr, config_len, 1, virtio_pci_config_writeb, proxy);
|
| 532 |
register_ioport_write(addr, config_len, 2, virtio_pci_config_writew, proxy);
|
| 533 |
register_ioport_write(addr, config_len, 4, virtio_pci_config_writel, proxy);
|
| 534 |
register_ioport_read(addr, config_len, 1, virtio_pci_config_readb, proxy);
|
| 535 |
register_ioport_read(addr, config_len, 2, virtio_pci_config_readw, proxy);
|
| 536 |
register_ioport_read(addr, config_len, 4, virtio_pci_config_readl, proxy);
|
| 537 |
|
| 538 |
if (vdev->config_len)
|
| 539 |
vdev->get_config(vdev, vdev->config); |
| 540 |
} |
| 541 |
|
| 542 |
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, |
| 543 |
uint32_t val, int len)
|
| 544 |
{
|
| 545 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 546 |
|
| 547 |
if (PCI_COMMAND == address) {
|
| 548 |
if (!(val & PCI_COMMAND_MASTER)) {
|
| 549 |
if (!(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
|
| 550 |
virtio_pci_stop_ioeventfd(proxy); |
| 551 |
virtio_set_status(proxy->vdev, |
| 552 |
proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); |
| 553 |
} |
| 554 |
} |
| 555 |
} |
| 556 |
|
| 557 |
pci_default_write_config(pci_dev, address, val, len); |
| 558 |
msix_write_config(pci_dev, address, val, len); |
| 559 |
} |
| 560 |
|
| 561 |
static unsigned virtio_pci_get_features(void *opaque) |
| 562 |
{
|
| 563 |
VirtIOPCIProxy *proxy = opaque; |
| 564 |
return proxy->host_features;
|
| 565 |
} |
| 566 |
|
| 567 |
static void virtio_pci_guest_notifier_read(void *opaque) |
| 568 |
{
|
| 569 |
VirtQueue *vq = opaque; |
| 570 |
EventNotifier *n = virtio_queue_get_guest_notifier(vq); |
| 571 |
if (event_notifier_test_and_clear(n)) {
|
| 572 |
virtio_irq(vq); |
| 573 |
} |
| 574 |
} |
| 575 |
|
| 576 |
static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign) |
| 577 |
{
|
| 578 |
VirtIOPCIProxy *proxy = opaque; |
| 579 |
VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
| 580 |
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
| 581 |
|
| 582 |
if (assign) {
|
| 583 |
int r = event_notifier_init(notifier, 0); |
| 584 |
if (r < 0) { |
| 585 |
return r;
|
| 586 |
} |
| 587 |
qemu_set_fd_handler(event_notifier_get_fd(notifier), |
| 588 |
virtio_pci_guest_notifier_read, NULL, vq);
|
| 589 |
} else {
|
| 590 |
qemu_set_fd_handler(event_notifier_get_fd(notifier), |
| 591 |
NULL, NULL, NULL); |
| 592 |
event_notifier_cleanup(notifier); |
| 593 |
} |
| 594 |
|
| 595 |
return 0; |
| 596 |
} |
| 597 |
|
| 598 |
static bool virtio_pci_query_guest_notifiers(void *opaque) |
| 599 |
{
|
| 600 |
VirtIOPCIProxy *proxy = opaque; |
| 601 |
return msix_enabled(&proxy->pci_dev);
|
| 602 |
} |
| 603 |
|
| 604 |
static int virtio_pci_set_guest_notifiers(void *opaque, bool assign) |
| 605 |
{
|
| 606 |
VirtIOPCIProxy *proxy = opaque; |
| 607 |
VirtIODevice *vdev = proxy->vdev; |
| 608 |
int r, n;
|
| 609 |
|
| 610 |
for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
| 611 |
if (!virtio_queue_get_num(vdev, n)) {
|
| 612 |
break;
|
| 613 |
} |
| 614 |
|
| 615 |
r = virtio_pci_set_guest_notifier(opaque, n, assign); |
| 616 |
if (r < 0) { |
| 617 |
goto assign_error;
|
| 618 |
} |
| 619 |
} |
| 620 |
|
| 621 |
return 0; |
| 622 |
|
| 623 |
assign_error:
|
| 624 |
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
|
| 625 |
while (--n >= 0) { |
| 626 |
virtio_pci_set_guest_notifier(opaque, n, !assign); |
| 627 |
} |
| 628 |
return r;
|
| 629 |
} |
| 630 |
|
| 631 |
static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign) |
| 632 |
{
|
| 633 |
VirtIOPCIProxy *proxy = opaque; |
| 634 |
|
| 635 |
/* Stop using ioeventfd for virtqueue kick if the device starts using host
|
| 636 |
* notifiers. This makes it easy to avoid stepping on each others' toes.
|
| 637 |
*/
|
| 638 |
proxy->ioeventfd_disabled = assign; |
| 639 |
if (assign) {
|
| 640 |
virtio_pci_stop_ioeventfd(proxy); |
| 641 |
} |
| 642 |
/* We don't need to start here: it's not needed because backend
|
| 643 |
* currently only stops on status change away from ok,
|
| 644 |
* reset, vmstop and such. If we do add code to start here,
|
| 645 |
* need to check vmstate, device state etc. */
|
| 646 |
return virtio_pci_set_host_notifier_internal(proxy, n, assign);
|
| 647 |
} |
| 648 |
|
| 649 |
static void virtio_pci_vmstate_change(void *opaque, bool running) |
| 650 |
{
|
| 651 |
VirtIOPCIProxy *proxy = opaque; |
| 652 |
|
| 653 |
if (running) {
|
| 654 |
virtio_pci_start_ioeventfd(proxy); |
| 655 |
} else {
|
| 656 |
virtio_pci_stop_ioeventfd(proxy); |
| 657 |
} |
| 658 |
} |
| 659 |
|
| 660 |
static const VirtIOBindings virtio_pci_bindings = { |
| 661 |
.notify = virtio_pci_notify, |
| 662 |
.save_config = virtio_pci_save_config, |
| 663 |
.load_config = virtio_pci_load_config, |
| 664 |
.save_queue = virtio_pci_save_queue, |
| 665 |
.load_queue = virtio_pci_load_queue, |
| 666 |
.get_features = virtio_pci_get_features, |
| 667 |
.query_guest_notifiers = virtio_pci_query_guest_notifiers, |
| 668 |
.set_host_notifier = virtio_pci_set_host_notifier, |
| 669 |
.set_guest_notifiers = virtio_pci_set_guest_notifiers, |
| 670 |
.vmstate_change = virtio_pci_vmstate_change, |
| 671 |
}; |
| 672 |
|
| 673 |
static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev, |
| 674 |
uint16_t vendor, uint16_t device, |
| 675 |
uint16_t class_code, uint8_t pif) |
| 676 |
{
|
| 677 |
uint8_t *config; |
| 678 |
uint32_t size; |
| 679 |
|
| 680 |
proxy->vdev = vdev; |
| 681 |
|
| 682 |
config = proxy->pci_dev.config; |
| 683 |
pci_config_set_vendor_id(config, vendor); |
| 684 |
pci_config_set_device_id(config, device); |
| 685 |
|
| 686 |
config[0x08] = VIRTIO_PCI_ABI_VERSION;
|
| 687 |
|
| 688 |
config[0x09] = pif;
|
| 689 |
pci_config_set_class(config, class_code); |
| 690 |
|
| 691 |
config[0x2c] = vendor & 0xFF; |
| 692 |
config[0x2d] = (vendor >> 8) & 0xFF; |
| 693 |
config[0x2e] = vdev->device_id & 0xFF; |
| 694 |
config[0x2f] = (vdev->device_id >> 8) & 0xFF; |
| 695 |
|
| 696 |
config[0x3d] = 1; |
| 697 |
|
| 698 |
if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) { |
| 699 |
pci_register_bar(&proxy->pci_dev, 1,
|
| 700 |
msix_bar_size(&proxy->pci_dev), |
| 701 |
PCI_BASE_ADDRESS_SPACE_MEMORY, |
| 702 |
msix_mmio_map); |
| 703 |
} else
|
| 704 |
vdev->nvectors = 0;
|
| 705 |
|
| 706 |
proxy->pci_dev.config_write = virtio_write_config; |
| 707 |
|
| 708 |
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len; |
| 709 |
if (size & (size-1)) |
| 710 |
size = 1 << qemu_fls(size);
|
| 711 |
|
| 712 |
pci_register_bar(&proxy->pci_dev, 0, size, PCI_BASE_ADDRESS_SPACE_IO,
|
| 713 |
virtio_map); |
| 714 |
|
| 715 |
if (!kvm_has_many_ioeventfds()) {
|
| 716 |
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; |
| 717 |
} |
| 718 |
|
| 719 |
virtio_bind_device(vdev, &virtio_pci_bindings, proxy); |
| 720 |
proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
|
| 721 |
proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
|
| 722 |
proxy->host_features = vdev->get_features(vdev, proxy->host_features); |
| 723 |
} |
| 724 |
|
| 725 |
static int virtio_blk_init_pci(PCIDevice *pci_dev) |
| 726 |
{
|
| 727 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 728 |
VirtIODevice *vdev; |
| 729 |
|
| 730 |
if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
|
| 731 |
proxy->class_code != PCI_CLASS_STORAGE_OTHER) |
| 732 |
proxy->class_code = PCI_CLASS_STORAGE_SCSI; |
| 733 |
|
| 734 |
vdev = virtio_blk_init(&pci_dev->qdev, &proxy->block); |
| 735 |
if (!vdev) {
|
| 736 |
return -1; |
| 737 |
} |
| 738 |
vdev->nvectors = proxy->nvectors; |
| 739 |
virtio_init_pci(proxy, vdev, |
| 740 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
| 741 |
PCI_DEVICE_ID_VIRTIO_BLOCK, |
| 742 |
proxy->class_code, 0x00);
|
| 743 |
/* make the actual value visible */
|
| 744 |
proxy->nvectors = vdev->nvectors; |
| 745 |
return 0; |
| 746 |
} |
| 747 |
|
| 748 |
static int virtio_exit_pci(PCIDevice *pci_dev) |
| 749 |
{
|
| 750 |
return msix_uninit(pci_dev);
|
| 751 |
} |
| 752 |
|
| 753 |
static int virtio_blk_exit_pci(PCIDevice *pci_dev) |
| 754 |
{
|
| 755 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 756 |
|
| 757 |
virtio_pci_stop_ioeventfd(proxy); |
| 758 |
virtio_blk_exit(proxy->vdev); |
| 759 |
blockdev_mark_auto_del(proxy->block.bs); |
| 760 |
return virtio_exit_pci(pci_dev);
|
| 761 |
} |
| 762 |
|
| 763 |
static int virtio_serial_init_pci(PCIDevice *pci_dev) |
| 764 |
{
|
| 765 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 766 |
VirtIODevice *vdev; |
| 767 |
|
| 768 |
if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
|
| 769 |
proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
|
| 770 |
proxy->class_code != PCI_CLASS_OTHERS) /* qemu-kvm */
|
| 771 |
proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER; |
| 772 |
|
| 773 |
vdev = virtio_serial_init(&pci_dev->qdev, proxy->max_virtserial_ports); |
| 774 |
if (!vdev) {
|
| 775 |
return -1; |
| 776 |
} |
| 777 |
vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED |
| 778 |
? proxy->max_virtserial_ports + 1
|
| 779 |
: proxy->nvectors; |
| 780 |
virtio_init_pci(proxy, vdev, |
| 781 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
| 782 |
PCI_DEVICE_ID_VIRTIO_CONSOLE, |
| 783 |
proxy->class_code, 0x00);
|
| 784 |
proxy->nvectors = vdev->nvectors; |
| 785 |
return 0; |
| 786 |
} |
| 787 |
|
| 788 |
static int virtio_serial_exit_pci(PCIDevice *pci_dev) |
| 789 |
{
|
| 790 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 791 |
|
| 792 |
virtio_serial_exit(proxy->vdev); |
| 793 |
return virtio_exit_pci(pci_dev);
|
| 794 |
} |
| 795 |
|
| 796 |
static int virtio_net_init_pci(PCIDevice *pci_dev) |
| 797 |
{
|
| 798 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 799 |
VirtIODevice *vdev; |
| 800 |
|
| 801 |
vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net); |
| 802 |
|
| 803 |
vdev->nvectors = proxy->nvectors; |
| 804 |
virtio_init_pci(proxy, vdev, |
| 805 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
| 806 |
PCI_DEVICE_ID_VIRTIO_NET, |
| 807 |
PCI_CLASS_NETWORK_ETHERNET, |
| 808 |
0x00);
|
| 809 |
|
| 810 |
/* make the actual value visible */
|
| 811 |
proxy->nvectors = vdev->nvectors; |
| 812 |
return 0; |
| 813 |
} |
| 814 |
|
| 815 |
static int virtio_net_exit_pci(PCIDevice *pci_dev) |
| 816 |
{
|
| 817 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 818 |
|
| 819 |
virtio_pci_stop_ioeventfd(proxy); |
| 820 |
virtio_net_exit(proxy->vdev); |
| 821 |
return virtio_exit_pci(pci_dev);
|
| 822 |
} |
| 823 |
|
| 824 |
static int virtio_balloon_init_pci(PCIDevice *pci_dev) |
| 825 |
{
|
| 826 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 827 |
VirtIODevice *vdev; |
| 828 |
|
| 829 |
vdev = virtio_balloon_init(&pci_dev->qdev); |
| 830 |
virtio_init_pci(proxy, vdev, |
| 831 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
| 832 |
PCI_DEVICE_ID_VIRTIO_BALLOON, |
| 833 |
PCI_CLASS_MEMORY_RAM, |
| 834 |
0x00);
|
| 835 |
return 0; |
| 836 |
} |
| 837 |
|
| 838 |
#ifdef CONFIG_VIRTFS
|
| 839 |
static int virtio_9p_init_pci(PCIDevice *pci_dev) |
| 840 |
{
|
| 841 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
| 842 |
VirtIODevice *vdev; |
| 843 |
|
| 844 |
vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); |
| 845 |
vdev->nvectors = proxy->nvectors; |
| 846 |
virtio_init_pci(proxy, vdev, |
| 847 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
| 848 |
0x1009,
|
| 849 |
0x2,
|
| 850 |
0x00);
|
| 851 |
/* make the actual value visible */
|
| 852 |
proxy->nvectors = vdev->nvectors; |
| 853 |
return 0; |
| 854 |
} |
| 855 |
#endif
|
| 856 |
|
| 857 |
static PCIDeviceInfo virtio_info[] = {
|
| 858 |
{
|
| 859 |
.qdev.name = "virtio-blk-pci",
|
| 860 |
.qdev.alias = "virtio-blk",
|
| 861 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
| 862 |
.init = virtio_blk_init_pci, |
| 863 |
.exit = virtio_blk_exit_pci, |
| 864 |
.qdev.props = (Property[]) {
|
| 865 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
| 866 |
DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, block), |
| 867 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
|
| 868 |
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
|
| 869 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
| 870 |
DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features), |
| 871 |
DEFINE_PROP_END_OF_LIST(), |
| 872 |
}, |
| 873 |
.qdev.reset = virtio_pci_reset, |
| 874 |
},{
|
| 875 |
.qdev.name = "virtio-net-pci",
|
| 876 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
| 877 |
.init = virtio_net_init_pci, |
| 878 |
.exit = virtio_net_exit_pci, |
| 879 |
.romfile = "pxe-virtio.bin",
|
| 880 |
.qdev.props = (Property[]) {
|
| 881 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
|
| 882 |
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
|
| 883 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3), |
| 884 |
DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features), |
| 885 |
DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic), |
| 886 |
DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy,
|
| 887 |
net.txtimer, TX_TIMER_INTERVAL), |
| 888 |
DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy,
|
| 889 |
net.txburst, TX_BURST), |
| 890 |
DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
|
| 891 |
DEFINE_PROP_END_OF_LIST(), |
| 892 |
}, |
| 893 |
.qdev.reset = virtio_pci_reset, |
| 894 |
},{
|
| 895 |
.qdev.name = "virtio-serial-pci",
|
| 896 |
.qdev.alias = "virtio-serial",
|
| 897 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
| 898 |
.init = virtio_serial_init_pci, |
| 899 |
.exit = virtio_serial_exit_pci, |
| 900 |
.qdev.props = (Property[]) {
|
| 901 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
|
| 902 |
DEV_NVECTORS_UNSPECIFIED), |
| 903 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
| 904 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
| 905 |
DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
|
| 906 |
31),
|
| 907 |
DEFINE_PROP_END_OF_LIST(), |
| 908 |
}, |
| 909 |
.qdev.reset = virtio_pci_reset, |
| 910 |
},{
|
| 911 |
.qdev.name = "virtio-balloon-pci",
|
| 912 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
| 913 |
.init = virtio_balloon_init_pci, |
| 914 |
.exit = virtio_exit_pci, |
| 915 |
.qdev.props = (Property[]) {
|
| 916 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
| 917 |
DEFINE_PROP_END_OF_LIST(), |
| 918 |
}, |
| 919 |
.qdev.reset = virtio_pci_reset, |
| 920 |
},{
|
| 921 |
#ifdef CONFIG_VIRTFS
|
| 922 |
.qdev.name = "virtio-9p-pci",
|
| 923 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
| 924 |
.init = virtio_9p_init_pci, |
| 925 |
.qdev.props = (Property[]) {
|
| 926 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
| 927 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
| 928 |
DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
|
| 929 |
DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
|
| 930 |
DEFINE_PROP_END_OF_LIST(), |
| 931 |
}, |
| 932 |
}, {
|
| 933 |
#endif
|
| 934 |
/* end of list */
|
| 935 |
} |
| 936 |
}; |
| 937 |
|
| 938 |
static void virtio_pci_register_devices(void) |
| 939 |
{
|
| 940 |
pci_qdev_register_many(virtio_info); |
| 941 |
} |
| 942 |
|
| 943 |
device_init(virtio_pci_register_devices) |